Spectrally resolved light absorption properties of cooled soot from a methane flame

  1. Get@NRC: Spectrally resolved light absorption properties of cooled soot from a methane flame (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1007/s00340-011-4448-9
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Journal titleApplied Physics B: Lasers and Optics
Pages175188; # of pages: 14
SubjectAbsorption property; At-wavelength; Climate modeling; Combustion-generated soots; Degree of scatter; FRactal aggregate; Line-of-sight attenuations; Mass absorption; Mass densities; Methane flame; Optical extinction; Polydisperses; Rayleigh-Debye-Gans approximations; Scanning and transmission electron microscopy; Scatter correction; Soot emissions; Wavelength ranges; Absorption; Light absorption; Methane; Polydispersity; Refractive index; Soot; Transmission electron microscopy; Uncertainty analysis; Dust
AbstractThe optical properties of combustion-generated soot, crucial information for quantitative soot emission diagnostics and for climate modeling, have been determined for the particular case of cooled soot from a methane flame. Optical extinction measurements were performed over a wavelength range of 450-750 nm using a novel diffuse-light, spectrally resolved line-of-sight attenuation experiment, and quantified using extractive methods coupled with scanning and transmission electron microscopy in conjunction with a detailed uncertainty analysis. The absorption component of the total measured extinction was isolated by calculating the expected scattering contribution, according to the Rayleigh-Debye-Gans approximation for polydisperse fractal aggregates. In contrast to the large degree of scatter seen in data previously reported in the literature, a consistent trend of negligible variation of the soot absorption refractive index function E(m) with wavelength over the visible was observed (E(m)=0.35±0.03 at wavelengths of 450-750 nm). These new data are also cast in the form of dimensionless extinction, which is independent of the scatter correction, as well as mass absorption cross section, which is independent of the mass density of soot and is commonly used by atmospheric modelers. © 2011 Her Majesty the Queen in Right of Canada.
Publication date
AffiliationNational Research Council Canada (NRC-CNRC); NRC Institute for Chemical Process and Environmental Technology (ICPET-ITPCE)
Peer reviewedYes
NPARC number21271413
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Record identifierbf1e9c5d-2b60-4731-baa6-0e1b6154caa2
Record created2014-03-24
Record modified2016-05-09
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